Blizzard 1

Had that happen on a 05 CV 713 the wires that run up the steering column go to turn signal switch with the wheel tilted up no lights wheel down had lights

As many here know I purchase a 2001 CX613 this past summer and I put it to work in September. Last week I was coming home after droping off a trailer and the clearance light on the top of the cab went out. not the tree in the middle but the one on the out side along with some of the trailer lights too. All the lights that are operated by the second light switch on the dash or the clearance flash on the end of the turn siginal switch.

I have checked all of the breakers the switch in the dash, replaced the daytime running relay (98.00) in the braker boxand the trun signal switch (125.00) and still have not made any differeance the lights do not work still. I have been to the local Mack dealer several times and they can't seam to be able to tell me where I can get a wiring digram for this circit

What's the best way to flush cooling system on 2000 CH613 with E7 427?